Or Bitwarden's Passwordless.dev which is free for 10,000 users. The pro plan is $0.05 per user/month for the first 10,000 users and $0.01/user for users above 1

Or Bitwarden's Passwordless.dev which is free for 10,000 users. The pro plan is $0.05 per user/month for the first 10,000 users and $0.01/user for users above 10,000.